Vintage Triangular Architect Drafting Scales 3 Sided Ruler Metal Brass NOS

Lot 4 Vintage 3 Side Architect & Engineer Rulers/ More Flat Rulers

Set Of ALVIN 240P & 241P Architect & Enginer Scale Drafting Triangular Ruler

Lot of 3 Vintage 3 Sided Triangle Drafting Engineering Rulers Hemmi Teledyne

2 Enginner & 1 Architect 12" Triangular Drafting Scale Rulers Alvin W.T. Rogers

Vintage Unitech Lettering Set NO. 3 Drafting Kit Templates. ML

Lot of 5 Drafting / Architect / Engineering Plastic 3-Sided Triangle Rulers

Vintage Lot of 4 Engineering Drafting Rulers Alvin, Helix, Teledyne, Sterling